Plaster board



June 19,- 192s. 1,673344 A. F. H. KOHLER El' AL PLASTER BOARD Filed March 2, 1.922

Patented June 19, 1928.

UNITED STATES:

PATENT oFElcE.- f

.AUGUST F. H. :KHLER AND ALEXANDER S. SPEER, OF BUFFALO, NEW YORK, AS-

SIGNORS, BY MESNE ASSIGNMENTS, TO UNITED CHICAGO, ILLINOIS.

STATES GYPSUIM COMPANY, A0.1i'

rLAs'rER BOARD.

Application led March 2, 1922. Serial No. 540,412.

This invention relates to plaster board or the like and the method of making it.

Among other objects, the invention is in tended to provide an improved plaster 5 board, the edge of which is capable of making a close and neat joint with the edge of an adjacent board or the like and which may be easily and inexpensively made. The invention consists in the novel coni@ structions, combinations and methods, hereinafter described or claimed, for carrying out the above stated object and such other objects as will hereinafter appear.

The invention may be best understood by l5 referring to one illustrative construction einlbodying the invention, such as that shown, for example, in the accompanying drawing. ln said drawing:

Fig. 1 is-a perspective view of portions of 5@ adjacent or abutting boards.

Fig. 2 is a transverse section of a board vand illustrating also a lilled joint between adjacent boards.

Fig. 3 is a transverse section of a boa-rd as- !5 it appears at one stage of manufacture.

In the drawing, 10 and 11 designate,.re spectively, what may 'be termed for convenience, top and bottom cover sheets. Such sheets are preferably of fibrous character, o such as paper of the proper quality. Be-

tween the cover sheets is a body 12 of plaster' or the like to which the cover sheets preferably adhere.

A plaster board of...this character may be 5 conveniently made in the ordinary plasterV board machine in which a suitable quantity of plaster is deposited on the traveling lower cover l sheet, preferably, somewhat wider than the -intended width of the board. The top cover sheet, also, preferably, wider than the intended width of the board, is then applied, and the plaster is spread to an even depth, for instance, by passing' the cover sheets with the interposed layer of plaster between a pair of spreading rolls which produce a body of plaster of uniform thickness to which the cover sheets firmly adhere.

During the process of manufacture, the margins 13 o f the lower cover -sheet 11 are o turned up so as to form a covering for the edge of theplaster body. The intermediate portions 14 of the margin contacting with the edge of the plaster body 12 are arranged so that a portion or all thereof is'inclined to the plane of the face of the board, or, in the form shown lies inside the vertical planesr passing the corners 15 of the board. ln the illustrative board, this is eected by inclining or beveling the portions 14 slightly inwardly of the corners 15 of the edges of the board, thereby giving the board a beveled edge. The outer portions 16 of the margins 13 are bent outwardly from the inside edfe of the board, substantially parallel to t e faces of the board, and are cemented to the projecting margins 17 ofthe top sheet 10 by any suitable adhesive. Preferably, these margins, 16 and 17, are cemented together by a slight amount of plaster 18 which creeps between the margins during the manufacture of the board.

After the board has been so formed, the margins 16 and 17 aretrimmed off if they project farther than is necessary for the edge construction desired.- In the illustrative board, the trimmed margins from the corner yond a vertical plane passing through the corners 15. This trimming may be effected by suitable trimming knives which are ad- `justed and arranged to trim olf the desired amount.

If desired, in order to form sharp corners at 15 or 20, the cover sheet l1 may be scored along lines representing these corners, lin order to weaken the paper along these lines.

In the ordinary use of the board, the sheet 11 forms what is termed the face sheet of the board, that is, this sheet appears on the outer face of the board as it |is ordinarily 'employed in a wall. However, the sheet also presents an unbroken surface, free from joints, and lin cases, for instance, Where the opposite face of the board is accidently marred or unsuitable for use as a face sheet, the board may be reversed so that the sheet 10 appears as the face sheet.

In Fig. 1 is illustrated a joint between a pair of abutting boards. The sharp corners at enable the formation of a close and neat joint.

(lil

- 19 which does not project substantially be-l If desired', in order to entirely-obliterate y these joints without the use of strips of ma- 'any particular construction, and the details of the illustrative board may be variously modified. Moreover, it is not indispensable that all features of the invention be used,

conjointly, as they may be used to advantage in various different combinations and subcombinations.

Having thus described our invention, we claim:

l. A plaster board or the like comprising, in combination, a layer ot' material forming the body of the board having an edge thereof beveled` and covering material enveloping said body and adhering thereto, the edges of said material substantially meetingi at the inside of the bevel of said edge and one of said edgesprojecting outwardly from the edge of said body.

2. A plaster board or the like comprising, in combination, a layer of material forming the body of the board having an edge thereof beveled, and covering material en veloping said body and adhering thereto, the edges of said material substantially meeting at the inside of the bevel ofy said edge and projecting outwardly to a point flush with the outer edge of said bevel.

3. A plaster board or the like com rising, in combination, a layer of material orming the body of the board having the side edges thereof inclined within the normal plane of the edge of the body, covering material enveloping and adhering to said body, the edges of said material meeting at the inner end of said inclined edges and rojecting outwardly from the edge of said iiody, said projecting edges capable of being trimmed off as desired to make the finished edge of the board. l

4. A plaster board comprising in combination, a relatively rigid board-like body of plaster having a plurality of covering sheets adhering to the faces thereof and adhesively reinforcing the body from edge to edge, said plaster body being formed with side edges each of which lies wholly in a plane inclined to the face of the board the said coverino sheet substantially meeting at the |inner e e of the bevel and extending outwardly sustantially fiush with the outer ed e.

n testimony whereof we have signed our names to this specification.

AUGUST F. H. KoHLER. ALEXANDER s. sPEER. 

